High 7.8Published Jun 25, 2026

CVE-2026-53242ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams

Updated under an hour ago (Oct 28, 2026, 2:10 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams snd_pcm_drain() uses init_waitqueue_entry which does not clear entry.prev/next, and add_wait_queue with a conditional remove_wait_queue that is skipped when to_check is no longer in the group after concurrent UNLINK. The orphaned wait entry remains on the unlinked substream sleep queue. On the next drain iteration, add_wait_queue adds the entry to a new queue while still linked on the old one, corrupting both lists. A subsequent wake_up dereferences NULL at the func pointer (mapped from the spinlock at offset 0 of the misinterpreted wait_queue_head_t), causing a kernel panic. Replace init_waitqueue_entry/add_wait_queue/conditional remove_wait_queue with init_wait_entry/prepare_to_wait/ finish_wait. init_wait_entry clears prev/next via INIT_LIST_HEAD on each iteration and sets autoremove_wake_function which auto-removes the entry on wake-up. finish_wait safely handles both the already-removed and still-queued cases.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9baee36e8c5443411c4629afabafaff8a46a23fd before cac5bf3500ee6422cf64e0df0b5daeecfed42917; from f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1 before 06eca2235a3fd281dddf25b0a97772b25b5bb573; from fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 before d842f26a167e77a36f3ed333b9fa99d36ef99fe6; from 629cf09464cf98670996ea5c191dc9743e6f3f00 before d68b621bb5a48051932f1017a6e1bc9b18f854d0; from ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 before b053fcd8912f06c30f932f5b8ec41c72de474695; from 4a758e9a1f5ed722f83c4dd35f867fe811553bcb before cd98837db15f323463b8df07282ac723bd5c3fed; 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 builds before 7c71a9522555ff137a9ca36b15d759ca04d84788; from 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 before 88fe2e3658726cb21ff2dcf9770bf672f9b9d31b; and 7 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.10.253 before 5.10.259; from 6.1.167 before 6.1.176; from 6.6.130 before 6.6.143; from 6.12.78 before 6.12.94; from 6.18.19 before 6.18.36; from 6.19.9 before 7.0; from 7.0.1 before 7.0.13; 7.0; and 10 more ranges	NVD

References

References

https://git.kernel.org/stable/c/cac5bf3500ee6422cf64e0df0b5daeecfed42917	patch
https://git.kernel.org/stable/c/06eca2235a3fd281dddf25b0a97772b25b5bb573
https://git.kernel.org/stable/c/d842f26a167e77a36f3ed333b9fa99d36ef99fe6	patch
https://git.kernel.org/stable/c/d68b621bb5a48051932f1017a6e1bc9b18f854d0	patch
https://git.kernel.org/stable/c/b053fcd8912f06c30f932f5b8ec41c72de474695	patch
https://git.kernel.org/stable/c/cd98837db15f323463b8df07282ac723bd5c3fed	patch
https://git.kernel.org/stable/c/7c71a9522555ff137a9ca36b15d759ca04d84788	patch
https://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.